The Raiders added a former Dolphins running back in the form of Raheem Mostert on Thursday. Miami is set to pull off the reverse. 
Alexander Mattison has a deal in place to join the Dolphins, Jordan Schultz of Fox Sports reports. After a single season with the Raiders, the former Viking will look to carve out a role in Miami’s backfield. He played on a one-year, $2MM deal in 2024, and this will likely be a similar pact.
Vegas saw Josh Jacobs depart in free agency last offseason, and signing Mattison was part of the team’s effort to replace him. The latter split time with Zamir White and Ameer Abdullah, seeing a total of eight starts during his 14 appearances. Mattson, 26, has only operated as a full-time starter once during his career (2022, the first year after Dalvin Cook‘s Vikings release). He will only be counted on to serve as a rotational back in Miami, though.
The Dolphins cut Mostert shortly after the end of the regular season, a move which confirmed De’Von Achane is set to remain the focal point of the team’s rushing attack. Achane is attached to his rookie contract, as is Jaylen Wright. The latter saw sparse usage on offense last season, but he could work his way into a larger role in Year 2. Even if that does not take place, Mattison will offer Miami a veteran backup option.
The Boise State product flashed potential during his time as Cook’s backup in Minnesota. His one year atop the depth chart produced career highs in rushing (700) and scrimmage (892) yards, but it included a yards per carry average of only 3.9. Mattison saw his efficiency drop to 3.2 yards per attempt in 2024 – a year in which, to be fair, the Raiders’ overall ground game struggled mightily – but his 294 receiving yards were the most of his career.
The Dolphins are positioned to have Achane and Wright in place as part of a cost-effective backfield for 2025 and beyond. Mattison could find success as a short-yardage option with Miami, though, and doing so could help his free agent prospects for next year.